I would put the tetras in the 15g. It's a bit small for them but it will do. You will need to do a fish in cycle which is this article. http://www.aquariumadvice.com/articl...now/Page2.html
Daily water changes and testing. Do you have a test kit yet? I recommend the API master test kit. Liquid tests NOT strips.

Ok being we have these 2 Tetras what others would you suggest. The guy at the LFS said I could have up to 12 of these in the new tank.
I'll have to play with the calculator that was shared with me.

If we decide to stick with this species what would be an ideal habitat? I read up that the Black Tetras like tall plants. What's your take on real or fake plants? The guy in the store danced around the topic and didn't answer all of my questions.
Probably tired of seeing me......

Ok being we have these 2 Tetras what others would you suggest. The guy at the LFS said I could have up to 12 of these in the new tank.
I'll have to play with the calculator that was shared with me.

If we decide to stick with this species what would be an ideal habitat? I read up that the Black Tetras like tall plants. What's your take on real or fake plants? The guy in the store danced around the topic and didn't answer all of my questions.
Probably tired of seeing me......

If we decide to stick with this species what would be an ideal habitat? I read up that the Black Tetras like tall plants. What's your take on real or fake plants? The guy in the store danced around the topic and didn't answer all of my questions.
Probably tired of seeing me......

I prefer real plants. What plants you can keep depends on your lighting. What kind of light and bulb do you have?